Getting the application doesn't let you play. The game is online, and you have to log into SC II with a battle.net account that has a StarCraft 2 Beta Key registered with it.
Yeah that's what i figured. So i went to Best Buy because I had placed my pre-order there a while back but never got a code. The girl at customer service had no clue what I was talking about. They said they will have the guy from Video Games call me tomorrow....